Welcome to Mac-Forums, Leke.

What type of surface are you using the MM on? I ask because a friend of mine bought a wireless Apple Keyboard and a Mighty Mouse and the surface was some kind of funky pattern that the sensors went haywire on. Once she placed a mouse pad under both of them, all worked perfectly.

Try putting a different surface under your MM and see where that takes you. Report back with the outcome. Good luck!